3v4l.org

run code in 500+ PHP versions simultaneously
<?php class Foo { public string $message = "yo"; function foo(callable $fn): void { $fn(); } function a() { $this->foo(function () { echo $this->message; }); } function b() { $this->foo(static function () { echo $this->message; }); } }
Output for 8.1.34, 8.2.27 - 8.2.32, 8.3.0 - 8.3.33, 8.4.1 - 8.4.24, 8.5.0 - 8.5.9

preferences:
40.22 ms | 778 KiB | 4 Q